Shy Guy Barrage
From the Super Mario Wiki
Shy Guy Barrage is the second secret level of Joke's End in the Minion Quest: The Search for Bowser mode in Mario & Luigi: Superstar Saga + Bowser's Minions. In order to obtain this level, the player has to use certain amiibo to unlock it.
The level has three battles. The first battle has one Fly Guy, two Bandits, four Shy Guys, and a Bandit captain. The second battle has two Fly Guys, three Spear Guys, two Shy Guys, and a Spear Guy captain. The third and final battle has three Fly Guys, four Spear Guys, and a Fly Guy captain.